Well pump



FIG. 3

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W. J. CRITES WELL PUMP Filed May 12, 1941 INVENTQR w, J. CRITES BY W 1ATTOR Y y w K April 6, 1943.

Patented Apr. 6, 1943 "PhllIipsFctroleuniCmM-a Delaware mlicatlon May1:. 1041. serial No. 303.105 4 claims. (Olres-s40 This invention relatesto deep well pumps. more particularly it relates to oil well pumpsergnploying air or gas pressure to lift oil from the w An object of thisinvention is to improve pumps oi the general type disclosed irrthe U. 8.Patent No. 2,202,970. granted to Steele; June' 4, 1940, and

other similar devices using a sliding or sleeve valve.

A further object of the invention is to provide a control valve for suchstructure 01' the poppet forming a part of this'speciilcation and inwhich:

Figure 1 is an elevation view of the pump structure positioned in a wellbore and showing the well casing. tubing strings, and surface equipment:Y

Figure 2 is a vezticahsectionai view oi the pump showing theconh-okvalve closed preventing gas under pressurelirom entering thefluid chamber;

Figure 3 is a transverse sectional view through the pump taken on theline 8-! oi Figure 2:

Figure 4 is a similar view taken on the line l-l of Figure 2; and

Figure 5 is, a similar view taken on the line H ol' Figure 2 In generalthe device forming the subject matter of the instantapplicationscomprises pumping apparatus which may located at the bottomof a well. having a "valve controlled by rotation of a tubingstring fromthesuriace which admits high pressure air or gas at the proper intervalsto a fluid accumulation chamber and thereby lifting the fluid tothe-surface.

Referring now more particularly to the drawing, the numeral ll generallydesignates the well bore in which fluid from the formation collects. Awell casing 12 is shown in which there is an outer tubing string it andan inner tubing string 80 suspended in the customary and usual mannorfrom the well head. Perforated bull plug Ii is attached to the lower endof outer tubing .inner tubing string. with a high pressure gas inlet 86,and a fluid outlet SI.

Threaded to the exterior on the lower end of inner tubingstrlng II is acoupling or valve body adapter I! in which is threaded the valve bodyII. This valve body has a bore I! extending through it from the upper tothe lower face. Within the valve body is a second bore II having itslower portion of reduced diameter to term an annular shoulder ll and itsupper portion threaded to receive a valve guide and cap 2!.

Positioned within bore 88 and guided by cap it is valve 22 or the poppettype having a coiled spring is on the upper part of the valve stem whichnormally holds the head ll seated on the annuiar shoulder II. The lowerpart of this valve stem extends through the lower part of bore llleaving the annular space ll open ior the passage of gas as hereinafterdescribed.

A horizontal passage 42 through the side of valve body 1' places theexterior thereof. space 2!, in communication with bore SI. Threaded intothe exterior of this passage is a restricted orifice plug ii.

The lower end of valve body II terminates in the bearing surface is.Ball bearings may be used at thispoint iispreierred although applicantprefers a bronsed sliding surface. Contacting this surface is the upperand ot the lower valve A body adapter 82. A retaining flange 2| securedwithin a recessed portion of this adapter and fastened by flange screwsII to the lower end of valve body II, has a bore 44 and a smaller bore4! extending through it, through which the lower end of valve 2!extends.

Attached to the lower end of this adapter I! is a cam body it having acentral bore ll extending through it and a cam II positioned on itsupper end. See Figures 2 and 3., Screwed into the lower end of bore itis a standing valve it with a ball II as customarily used in pumpequipment for oil welh. A packer ll, threaded to the exterior of the cambody, closes the annular space 28 between the outer and inner tubingstrings and 80. and supports the cam body ii and the valve body adapter8! in position.

Itwillbeseen from this construction that the vaivebody ll attached tothe inner tubing string 8| is 'free to rotate and the cam body i8 isheld firmly in place by packer i! with a bearing surface It beingprovided.

2 acumen In operation, the inner tubing Iii is rotated by means of thedrive head 34 at the well head. High pressure gas is admitted throughgas inlet It at the surface and passes down through the annular space 29between the inner and outer 5 tubing strings. Packer il closes thisspace at the bottom, the gas is thus forced through the oriflce is invalve body 2! through passage 42 and into bore 38, helping spring 23hold valve head 40 seated on shoulder 39.

This pump to obtain its maximum eiflciency must be placed deep enough inthe well so that fluid from the formation will flll space 31 betweencasing i2 and tubing string II. and space it, unseatlng ball I! and flowup through stand- 1.,

ing valve it, bore l8, bore 44, and into bore a.

or even part way up into space II in the inner tubing string 30.

Then upon rotation of tubing string II, valve body It will be rotated,valve 22 will engage with com Ill and be raised against the pressure ofspring 23 and the gas in bore a. Gas will flow from this bore throughthe annular space it and up through bore 20 forcing the well fluid upthrough space It to the surface. When gas is 25 admitted from bore IIthe pressure on the well fluid will close hell it in standing valve IIand the producing formation will be protected from the high pressure gasand the fluid trapped above bell II will be forced from the pumppassages, through the inner tubing string to the surface and out of thedischarge pipe ll.

While applicant has'descrlbed a speciflc embodiment, it is to beunderstood that the form oi this invention, herewith shown anddescribed,

is a preferred example only and that various modifications may be madetherein without materially departing from the spirit of this inventionas defined by the appended claims.

For example, applicant for the sake of brevity 40 has omitted adescription and drawing of his invention using only a single rotatabletubing string I0, eliminating the outer string of tubing i3, and withpacker l1 attached to the inner wall of the well casing it instead asshown. It is believed 5 that such a change would be obvious to thoseskilled in the art and is inherent in applicant's invention.

. Having thus described my invention, I claim:

- 1. In deep well lifting apparatus having rotatso able inner tubingdisposed within outer tubing and forming an annular space therewith, asource of high pressure gas communicating with the annular space,surface means for rotating the inner tubing, and a pumping mechanismhaving 5 a fluid accumulation chamber communicatinr with the innertubing, a passage in the pumping mechanism establishing communicationbetween the annular space and the fluid accumulationchamber, saidpassage alternately opening and closing to admit gas at regularintervals into the fluid accumulation chamber, the improvement in thepumping mechanism comprising a valve body connected to the inner tubingand rotatable therewith, a gas inlet passage in the valve body,

a valve within the valve body for opening and closing the gas inletpassage, a fluid passage extending through the valve body, a cam bodyassociated with the valve body, a cam on the cam body cooperating withthe valve to actuate the same at regular intervals, a check valvecontrolled passage in the cam body, and means for preventing rotation oithe cam body with respect I to the valve body.

ing with the inner tubing, a passage in the pumping mechanismestablishing communication between the annular space and the mildaccumulation chamber, said passage alternately opening and closing toadmit gas at regular intervals into the fluid accumulation chamber, theimprovement in the pumping mechanism comprising a valve body attached tothe inner tubing and having a fluid passage therein communicating withthe inner tubing string and a gas inlet passage communicating with saidfluid passage, a valve within the valve body for controlling the flow ofgas through the gas inlet passage, cam means adapted to actuate thevalve at regular intervals, a check valve controlled fluid passage inthe cam means communicating with the fluid passage in able inner tubingdisposed within outer tubing and i'orming an annular space therewith, asource of high pressure gas communicating with the annular space,surface means for rotating the inner tubing, and a pumping mechanismhaving a fluid accumulation chamber communicating with the inner tubing,a passage in the pump ing mechanism establishing communication betweenthe annular space and the fluid accumulation chamber. said passagealternately opening and closing to admit gas at regular intervals intothe fluid accumulation chamber, the improvement in the pumping mechanismcomprising a valve body having a valve therein connected to the innertubing to control flow through the passage, a cam secured to the outertubing, said valve rotatirm with respect to the cam upon rotation of theinner tubing and said cam on seating said valve-at regular intervals toopen the passage in the valve body. a

4. In deep well lifting apparatus having inner tubing disposed withinouter tubingand forming an annular space therewith, a source'oi' highpressure as communicating with the annular space, surface means forrotating the inner tubing, and a pumping mechanism having a fluidaccumulation chamber communicating with the inner tubing, a passage inthe pumping mechanism establishing communication between the annularspace and the fluid accumulation chamber, said passage alternatelyopening and closing to admit gas at regular intervals into the fluidaccumulation chamber, the improvement in the pumping mechanismcomprising a cam body secured to the outer tubing, a valve controlledfluid passage in the cam body, a valve body secured to the end or theinner tubing and rotatable therewith enga in the top of the cam body, afluid passage in the valve body, a valve in the valve body coacting withthe cam body for opening and closing the passage in the valve body atregular intervals.

WILBUR J. CRITEB.

